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Your search for “corrosion” returned 39 results.

  • Ocean Desalination Water Quality Integration Study at West Basin

    Jan 16, 2014  |  Publications

    …of different water qualities. Corrosion Analysis Unlined cast iron pipe was evaluated for release of iron and manganese; cement mortar-lined pipe was evaluated for leaching of aluminum indicative of corrosion; and copper pipe and brass meters were analyzed for metals release including lead, copper, and zinc. Pipe loops were operated…

  • TDS Impacts on Wastewater Treatment and NPDES Permit Compliance

    Aug 18, 2014  |  Publications

    …treatment, an evaluation of structural/corrosion concerns, aeration, nitrification, sludge settling, solids precipitation, biosolids disposal, UV disinfection, metals, and whole effluent toxicity (WET) are critical factors that must be considered prior to accepting a high-strength TDS industry. The WET evaluation requires a series of increasing strength TDS dilutions and then assessing…

  • Increasing Reuse Supplies by Blending Nano-Concentrate with Treated Effluent

    Jan 16, 2014  |  Publications

    …of protection to address corrosion issues. In either instance, the net result was loss of a valuable resource. The Loxahatchee River District (LRD), which was one of the first reuse facilities in the State of Florida, needed additional irrigation quality water to meet ever increasing reuse demands. The LRD reuse…

  • Successful Risk-Based Phased Approach Helps REWA Prioritize and Plan Force Main Assessment

    Mar 16, 2016  |  Publications

    …location under busy roads, corrosion risk, etc. The combination of the CoF and PoF is called the “risk score”. We used a combination of GIS and in-house risk software to automatically generate risk scores for each 500’ segment of force main (FM) and rank each FM segment and individual components…

  • Fast-Track Design for Regulatory Compliance at the 285-MGD Potomac WFP

    May 10, 2010  |  Projects

    …bench-scale testing results of corrosion potential on differing pipe materials, particularly when switching from PACl to ferric chloride (and back again) * Evaluating alternative pH and alkalinity adjustment chemicals and developing associated design concept * Developing final (biddable) design documents for the construction of the required chemical feed improvements The…

  • Tap Sampling Procedures to Characterize Lead Changes Following Lead Service Line Replacement

    May 30, 2017  |  Publications

    …deposits of lead in corrosion scales of interior premise plumbing. Based on reports in the literature, physical disturbance of these existing corrosion scales during full LSLR can cause a short-term increase in lead release, primarily in the form of particulate lead. Thus, a re-stabilization period of up to 3 months…

  • Process Study and Ferric Sulfate Conversion to Comply with the Stage 2 D/DBP Rule

    Sep 27, 2010  |  Publications

    …both plants due to corrosion concerns (chloride/sulfate ratio) with ferric chloride. The two plants made the full-scale conversion to ferric sulfate during the summer 2008. Hazen and Sawyer staff were present to assist plant staff during the conversion process. Both plants have performed very well since the conversion, producing high…

  • 2016 NC AWWA-WEA Annual Conference

    Oct 18, 2016  |  News

    (RALEIGH, NC) – Hazen and Sawyer staff will conduct 15 presentations at the 96th NC AWWA-WEA Annual Conference, to be held November 13-16, 2016.

  • 2017 Tri-Association Conference Presentations

    Aug 09, 2017  |  News

    (BALTIMORE, MD) – Hazen and Sawyer staff will conduct 10 presentations at the 2017 Tri-Association Conference.

  • Drinking Water Research and Innovation

    Mar 08, 2011  |  About

    …our water supply, controlling corrosion and disinfection by-products in a distribution system, making the most efficient use of membranes, or assessing and managing the risks of climate change and extreme weather events, Hazen and Sawyer’s leading experts are working with top research foundations and some of the world’s largest utilities…

  • Reducing Lead Levels in Drinking Water

    Nov 01, 2017  |  Publications

    …actions associated with optimal corrosion control treatment, lead service line replacement, public education, and localized household-level responses (USEPA and NDWAC, 2016). Action Levels and Sampling Requirements The current Lead and Copper Rule lead action limit (AL) of 15 μg/L, which serves as a benchmark for effective corrosion control treatment, is…

  • “Vortexing” Away Hydrogen Sulfide – Reducing H2S Concentrations

    Feb 21, 2017  |  Publications

    …extent of odors and corrosion potential within a portion of the JMWSC’s collection system. This project was divided into two phases with the first phase evaluating the wastewater and providing recommendations. The second phase was the implementation of the recommendations to achieve acceptable levels of hydrogen sulfide within the system.…

  • Drinking Water Process Studies

    Apr 15, 2013  |  Services

    …of treatment issues, including corrosion control. We have worked for some of the largest utilities in the country, as well as for many smaller utilities. Our scientists and engineers include top researchers whose work identifies innovative treatment methods, operational tools, and water quality modeling techniques, bolstering the expertise and big-picture…

  • New Paper on Lead and Copper Corrosion in Water Distribution Systems

    May 14, 2014  |  News

    (RALEIGH, NC) – Michael Wang and Weidong Zhang are co-authors of a new paper recently published in Journal of Environmental Engineering.

  • Practical Evaluation of Corrosion Before Water Quality Changes

    Nov 17, 2009  |  Publications

    …an increase in lead corrosion in some drinking water systems. Recent studies investigating lead corrosion problems experienced by water utilities after modifying their treatment process are still somewhat speculative despite hindsight into the possible causes. Part of the problem is that wholesale changes to a variety of water quality parameters…

  • Controlling Corrosion and Preserving Water Quality

    Aug 05, 2010  |  Publications

    …an increase in lead corrosion in some drinking water systems. Hazen and Sawyer has taken a practical approach to evaluating the corrosive effects of finished water quality changes, performing targeted testing from desktop/benchscale to flow-through pilot loop and full-scale studies to help utilities make educated decisions with regard to treatment…

  • Corrosion Control and the Impact that Coagulants Have – Balancing DBP, Lead, Copper Compliance

    Aug 09, 2017  |  Publications

    …the pipe material against corrosion by water. These scales have been influenced by historical water quality and treatment changes and any disruption to these scales can leave the piping material prone to corrosion including lead and copper. While there are many interrelated factors impacting the rate and type of corrosion,…

  • Long Term Strategies for Charlotte Water’s Corrosion Control Optimization

    Oct 18, 2016  |  Publications

    …to above 8.0 for corrosion control. Although a high finished water pH reduces the solubility of lead, it also favors production of THMs as well as reducing the disinfection efficiency of free chlorine. A corrosion control pilot study was performed to assess if a lower finished water pH, in conjunction…

  • Corrosion Control Study at Fayetteville’s P.O. Hoffer WTF

    Sep 27, 2010  |  Publications

    …zinc orthophosphate as the corrosion inhibitor chemical. The change in primary coagulant represents a significant change in finished water quality, and the NC DENR PWSS requires that a corrosion control study be conducted to optimize corrosion control under the new conditions. Fayetteville PWC authorized Hazen and Sawyer to conduct a…